+1: Your opponents do not gain flanking or higher ground bonuses against you.

+6: Your opponents do not inflict extra damage from the Power Attack option.

+11: Diverting Defense - As an immediate action, you may redirect an attack against you to any creature in your threatened range, friend or foe. You may not redirect an attack to the creature making the attack.

+16: As an immediate action, you may make an attack that would normally hit you miss instead.